1,2,3,6-tetrahydropyridine derivatives

ABSTRACT

THE PRESENT INVENTION RELATES TO NOVEL DERIVATIVES OF PROPANE-2,3-DIOL AND 3-MERCAPTO-PROPANE-2-O1, WHICH ARE THERAPEUTICALLY USEFUL, AND THEIR PROCESS OF PREPARATION. THE COMPOUNDS OF THE INVENTION HAVE THE FOLLOWING GENERAL FORMULA:   (-C(-CH3)2-CH2-Z-C(-CH3)2=)&gt;N-CH2-CH(-O-R1)-CH2-X-R   WHEREIN:   Z IS THE GROUP-CH=CHR IS ALKYL OF 1 TO 4 CARBON ATOMS; PHENYL SUBSTITUTED AT LEAST BY ONE OF LOWER ALKYL, CHLORO, METHOXY OR BENZYLOXY; NAPHTHYL; BENZYL; PHENETHYL; DIPHENYLMETHYL; PYRIDYL; X IS O OR S; AND R1 IS HYDROGEN ATOM OR -COR2 IN WHICH R2 IS PHENYL SUBSTITUTED BY AT LEAST ONE OF A CHLORINE-ATOM OR METHOXY; PHENOXYMETHYL, CHLOROPHENOXYMETHYL; STYRYL OR PYRIDYL.

3,702,850 1,2,3,6-TETRAHYDROPYRIDINE DERIVATIVES Andrea Pedrazzoli and Leone Dall Asta, Milan, Italy, assignors to Societe dEtudes de Recherches et dApplications Scientifiques et Medicales E.R.A.S.M.E., Paris, France No Drawing. Original application Aug. 21, 1967, Ser. No. 661,794. Divided and this application Nov. 20, 1970, Ser. No. 91,523

Claims priority, application Great Britain, Aug. 23, 1966,

37,833/66; Nov. 21, 1966, 52,071/66 Int. Cl. C07d 31/50 US. Cl. 260-294.8 G 6 Claims ABSTRACT OF THE DISCLOSURE The present invention relates to novel derivatives of propane-2,3-diol and 3-mercapto-propane-2-ol, which are therapeutically useful, and their process of preparation.

The compounds of the invention have the following general formula:

wherein:

Z is the group --CH=CH- R is alkyl of 1 to 4 carbon atoms; phenyl, phenyl substituted at least by one of lower alkyl, chloro, methoxy or benzyloxy; naphthyl; benzyl; phenethyl; diphenylmethyl; pyridyl;

X is O or S; and

R is hydrogen atom or -COR in which R is phenyl substituted by at least one of a chlorine-atom or methoxy; phenoxymethyl, chlorophenoxymethyl; styryl or pyridyl.

This is a divisional application of patent application Ser. No. 661,794, filed on Aug. 21, 1967, and now abandoned.

The products of the invention can be prepared according to a reaction shown by the following scheme:

(III) the product so obtained is reacted with an acid halide R COY (Y being a halogen) to give:

Z, X and R having the meanings given above.

United States Patent ice 3,702,850 Patented Nov. 14, 1972 The compounds such as III can also be synthesised by means of the following chemical reaction:

wherein:

Z is the group -CH=CH-- R is a straight or branched saturated aliphatic radical having 1 to 4 carbon atoms, a substituted or unsubstituted arylaliphatic radical, phenyl radical or naphthyl radical or a hexatomic heterocyclic ring containing one or two heteroatoms at least one of which is a nitrogen atom:

X is 0 or S;

R is a hydrogen atom or a COR radical which is either a saturated or unsaturated aliphatic acid residue with a straight or branched chain of 1 to 9 carbon atoms or a saturated or unsaturated aryl-aliphatic acid residue with a straight or branched chain of l to 4 carbon atoms or a substituted or unsubstituted aromatic acid residue or a hexatomic heterocyclic acid residue containing 1 or 2 heteroatoms, one of which is N, or a phenoxyacetic or phenylthioacetic acid residue which is substituted or unsubstituted in the ring.

The products of the invention can be prepared according to a reaction shown by the following scheme:

R-X-CHr-CH-CHz-N (III) the product so obtained is reacted with an acid halide R COY (Y being a halogen) to give:

CH3 CH3 CH3 CH3 III The compound I' used for this reaction can be obtained by reacting at boiling point compounds of the formula:

CE: CHa

with epichlorhydrin, in an inert solvent such as toluene or xylene, for periods of 12-72 hours, and then treating the cooled mass with pulverised anhydrous alkaline hydrates; the reaction product is then distilled.

When obtained by one or other of the reactions, to the point (III), it is isolated by distillation. It can be salified with an inorganic or organic acid to obtain pharmaceutically acceptable acid addition salts; it can also be esterified by reaction in an inert organic solvent, such as benzene, toluene, xylene, tetrahydrofuran or dimethylformamide, with an acid halide R COY (preferably an acid chloride R COCl) in the presence of a basic hydrogen acceptor, such as a tertiary amine for example. This esterification reaction takes place at room temperature but, to complete it, it is preferable to heat the mixture under reflux for several hours.

The products of the invention are stable to light and to heat and have a remarkable pharmacological activity, in particular as local anaesthetic agents.

The following examples illustrate the invention without limiting it.

EXAMPLE 1 1-( 1',2',3',6'-tetrahydro-2,2',6,6'-tetramethyl-pyridyl- 1)-3-(o-toloxy)-propane-2-ol hydrochloride A solution of 41 g. of l-(o-toloxy)-2,3-epoxy-propane and 35.5 g. of 1,2,3,6-tetrahydro-2,2,6,6-tetramethylpyridine was heated in ml. of n-butanol to for 18 hours, and first the solvent was distilled off under vacuum and then the product.

43 g. of yellow oil, B.P.=l96200 C. at 1.4 mm. Hg

was obtained. The oil was dissolved in anhydrous ethyl ether and was treated with an ethereal solution of hydrochloric acid until 42 g. of hydrochloride having M.P.= 182-184 C. were obtained.

The product, when crystallised from isopropanol, melted at -188.5 C.

EXAMPLE 2 1- 1',2',3 ,6'-tetrahydro-2',2,6',6-tetramethyl-pyridyl- 1')-3-(;3-phenethyloxy) -propane-2-o1 hydrochloride A solution of 35.6 g. of 1-(B-phenethyloxy-2,3-epoxypropane and 30.5 of 1,2,3,6-tetrahydro-2,2,6,6-tetramethyl-pyridine in 80 ml. of n-butanol was heated to 135 C. for 18 hours, and first the solvent was distilled olI under vacuum and then the product; 46 g. of oil having a B.P.=196-200 C. at 0.15 mm. Hg was obtained. The oil was dissolved in anhydrous ethyl ether and was treated with an ethereal solution of hydrochloric acid until 46 g. of hydrochloride having M.P.=146-149 C. were obtained.

The product, when crystallised from isopropanol, melted at 148.5l49.5 C.

EXAMPLE 3 1-( 1',2,3 ',6-tetrahydro-2',2,6',6'-tetramethyl-pyridyl- 1' -3-(p-chlorophenyl-thio) -propane-2-ol hydrochloride A solution of 41 g. of 1-(l',2',3',6'-tetrahydro-2',2', 6',6-tetramethyl-pyridyl-1')-2,3-epoxy-propane and 29 g. of p-chloro-thiophenol in 50 ml. of n-amyl alcohol was heated for 24 hours; after distilling off the solvent under vacuum, the oil obtained was dissolved in isopropanol and was acidified with gaseous HCl. After cooling, the product was filtered and crystallised from methanol to obtain 59 g. of product having M.P.=233235 C.

EXAMPLE 4 1')-3-(pyridyl-4"-thio)-propane-2-ol hydrochloride A solution of 41 g. of 1-(1,2',3',6' tetrahydro- '2',2,6',6 tetramethyl pyridyl 1') 2,3-epoxy-propane and 22.2 g of 4-mereaptopyridine in 100ml. of n-butanol was heated for 24 hours; after distilling 01f the solvent under vacuum, the oil obtained was dissolved in isopropanol and was acidified with gaseous HCl.

After cooling, the product was filtered and crystallised from isopropanol to obtain 36 g. of product having M.P.=216-218 C.

Examples of compounds of the invention are cited in the following table.

TABLE I H3O CH;

Z GENERAL FORMULA: RXCHz-(|3HCH;-N

H3O CH3 Compound 01 Formula of product Melting Example No. R R X Z obtained point 5..'.': G H O -CH=CH- CISHZ7NOZ'HO]. Bil-193 H O -CH=CH- CflHZONOz-HCI 186-188 TABLE IContinued Compound Formula of product; Melting Example No. R R X Z obtained point 7 Hi0 H 0 -CH=CH- CznHnNOg-HCI BIB-220 8..-.:'.::....-.:.r. Cl H O -CH=CH- CuHgoClNOz-HCI 192-194 9...:.::'::;::":':: till H O CH=CH- CllHZflClNOl-HCI 208-210. 5

10...;:::;'::::;': Cl H 0 CH=CH- CmHuClNOz-HC! 205-208" !1....2.:::.'...'.. H 0 0 H O -CH=CH- CnHuNOrHCl 188-190" 12 "2:; H H 0 CH-=CH- CwHnChNOz-HC] 206-207. 5

H 0 -CH=CH- CnHznNOg 175178(0. 15)

H O -CH=CH-- CzoHuNOz-HCl 148. 5-149. 5

H 0 -CH=CH- CnHuNOz'HCl 177. 5179 H S --CH=CH- CiaHaCINOS-HCI 233-235 H S --CH=C H- CnHznNOS 200-203 (1) H 8 CH=CH- CnHuNzOS-ZHCI 21621B The compounds of the invention have an excellent local anaesthetic activity by conduction, surface and infiltration.

This action has been evaluated according to the following tests:

(a) conduction anaesthesia in rats (Setnikar, I., Armeimittel-Forschung, 16, 1025, 1966) (b) conduction anaesthesia in mice (Bianchi, 0., 'Br. J. Pharmacol., 11, 104, 1956) (0) surface anaesthesia in rabbit eyes (Regnier, T., Bull. :Sci. PharmacoL, 30, 580 and 646, 1923). (d) infiltration anaesthesia in guineapigs :(Biilbring, E, Wajde, I., J. PharmacoL, 85, 78, 1945).

tology, dermatology and so on. Compound of Example 6, given in Table I, is the most active as a local anaesthetic agent.

What is claimed is:

1. A compound of the formula HgC CH;

NCH2CHCH:XR

R1 H10 CHI wherein:

R is alkyl of l to 4 carbon atoms; phenyl; phenyl substituted by lower alkyl, chloro, methoxy or benzyloxy; naphthyl, benzyl, phenethyl, diphenylmethyl, or pyridyl; X is O or S; and R is hydrogen, and its pharmaceutically acceptable acid addition salts. 2. 1-(1,2',3,6' tetrahydro 2',2',4',4' tetramethylpyridyl-l')-3-(o-toloxy)-propane-2-ol hydrochloride.

3. 1-(1',2,3',6' tetrahydro 2 ',2',6',6' tetramethylpyridyl-1')-3-(o-toloxy)-propane-2-ol hydrochloride. 

